Performance evaluation device for membrane filtration device in pure water production equipment, pure water production system using the same, and performance evaluation method for membrane filtration device in pure water production equipment

Abstract

A performance evaluation device of a membrane filtration device is a device for evaluating the performance of the membrane filtration device in pure water production equipment. The performance evaluation device includes branch lines that branch off at the inlet of the membrane filtration device from a line on which the membrane filtration device of the pure water production equipment is provided, and at least one evaluation filtration membrane device is connected to the branch lines. At least one of the evaluation filtration membrane devices has the same type of membrane as that of the membrane filtration device, and the membrane area of the membrane of at least one of the evaluation filtration membrane devices is smaller than the membrane area of the membrane of the membrane filtration device.

1 . A performance evaluation device for a membrane filtration device provided in pure water production equipment, comprising:
 a branch line that branches off from a line on which the membrane filtration device is provided in the pure water production equipment, at an inlet of the membrane filtration device; and   at least one evaluation filtration membrane device connected to the branch line, wherein   the at least one evaluation filtration membrane device has the same type of membrane as the membrane filtration device, and   the membrane area of the membrane of the at least one evaluation filtration membrane device is smaller than the membrane area of the membrane of the membrane filtration device.   
     
     
         2 . The performance evaluation device according to  claim 1 , wherein the at least one evaluation filtration membrane device comprises a first module,
 the performance evaluation device further comprising a membrane property evaluation device for evaluating a film property of the first module,   wherein the membrane property evaluation device measures at least one of an elongation retention rate of a fiber constituting the membrane of the first module and a fraction retention rate of the first module.   
     
     
         3 . The performance evaluation device according to  claim 2 , wherein the membrane property evaluation device outputs a notification prompting replacement of the membrane of the membrane filtration device when the elongation retention rate becomes 85% or less or the fraction retention rate becomes 70% or less. 
     
     
         4 . The performance evaluation device according to  claim 2 , further comprising a water quality meter provided at an outlet of the first module of the branch line. 
     
     
         5 . The performance evaluation device according to  claim 1 , wherein the at least one evaluation filtration membrane device comprises a second module,
 the performance evaluation device further comprising:   an addition line that is connected to an inlet of the second module on the branch line and that adds a substance to be evaluated; and   a detection device that is provided at an outlet of the second module of the branch line and that detects the substance to be evaluated.   
     
     
         6 . The performance evaluation device according to  claim 1 , wherein the at least one evaluation filtration membrane device comprises a plurality of first modules provided in parallel and a plurality of second modules provided in parallel. 
     
     
         7 . The performance evaluation device according to  claim 6 , wherein flow rates of the water supplied to the plurality of first modules are different from one another, and flow rates of the water supplied to the plurality of second modules are different from one another. 
     
     
         8 . The performance evaluation device according to  claim 1 , wherein a flow rate of water supplied to the at least one evaluation filtration membrane device is higher than a flow rate of water supplied to the membrane filtration device of the pure water production equipment. 
     
     
         9 . A performance evaluation method for a membrane filtration device provided in pure water production equipment, comprising:
 supplying inlet water of the membrane filtration device to at least one evaluation filtration membrane device connected to a branch line branching at an inlet of the membrane filtration device from a line on which the membrane filtration device of the pure water production equipment is provided; and   evaluating the performance of the membrane filtration device by measuring at least one of the physical properties of the at least one evaluation filtration membrane device and the water quality of the treated water of the at least one evaluation filtration membrane device, wherein:   the at least one evaluation filtration membrane device has the same type of membrane as the membrane filtration device; and   the membrane area of the membrane of the at least one evaluation filtration membrane device is smaller than the membrane area of the membrane of the membrane filtration device.   
     
     
         10 . A pure water production system comprising:
 a membrane filtration device;   a line on which the membrane filtration device is provided; and   the performance evaluation device according to  claim 1 .